I have a command \work which will format titles in SmallCaps and with less letter spacing. Now the funny thing: If I try to add some word spacing, too, and only for SmallCaps, it affects the whole document, as you can see in the MWE.
Any ideas how to achieve that the word spacing only affects SmallCaps or my command?

@musicman I already told you that negative letter spacing is exactly the contrary of what you should do; bigger word spacing only for small caps is something I can't understand the purpose of. Nonetheless, you seem to have discovered a bug in fontspec.
– egregOct 24 '14 at 17:29

(I know you don't like it. But I couldn't find a proper font which gives me a similar output. In fact I want less letterspacing, and so I also need to shrink the wordspacing... And I'm not happy to find bugs)
– musicmanOct 24 '14 at 17:33

Thank you for this easy workaround. Works perfectly! If I don't get other answers I will accept yours. My current LetterSpace is -4 btw :-)
– musicmanOct 24 '14 at 19:52

Even if I said this is a workaround, because if there were no bug you wouldn't need it, this is the official way of doing this. Since you don't want to change all the small caps from the document, just create a macro to document the work of an author…
– ManuelOct 24 '14 at 19:54

1

this really needs extra word space before (and possibly after) the title. mashing together the text with the title makes this really hard to read. (i agree that negative letterspacing is a bad thing, and increasing the word spacing makes things even worse.)
– barbara beetonFeb 16 '15 at 21:45

Your test confirm that we are not seen a bug. Word space is the distance between words. The question ask for a local word spacing and your excersie, proves that the parameter you found is an optimum for the letter space, for the given type face.
– djnavasApr 26 '16 at 17:03